Universal for iRobot Roomba 800 Series/900 Series sweeper 

When the sweeper works, the side brush adjusts and rotates to sweep the dust into the dust box

The innovative brush reaches deep into corners and edges to remove more dirt, dust and debris

Filters maintain Roomba's cleaning performance while reducing infiltration of dust, pollen and other allergens into the air you breathe

Replacement cycle usually the replacement period is 3-6 months